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// Copyright 2019 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "net/dns/host_resolver_mdns_listener_impl.h"
#include "base/check_op.h"
#include "base/notreached.h"
#include "net/base/host_port_pair.h"
#include "net/dns/host_cache.h"
#include "net/dns/host_resolver_mdns_task.h"
#include "net/dns/public/mdns_listener_update_type.h"
#include "net/dns/record_parsed.h"
namespace net {
namespace {
MdnsListenerUpdateType ConvertUpdateType(net::MDnsListener::UpdateType type) {
switch (type) {
case net::MDnsListener::RECORD_ADDED:
return MdnsListenerUpdateType::kAdded;
case net::MDnsListener::RECORD_CHANGED:
return MdnsListenerUpdateType::kChanged;
case net::MDnsListener::RECORD_REMOVED:
return MdnsListenerUpdateType::kRemoved;
}
}
} // namespace
HostResolverMdnsListenerImpl::HostResolverMdnsListenerImpl(
const HostPortPair& query_host,
DnsQueryType query_type)
: query_host_(query_host), query_type_(query_type) {
DCHECK_NE(DnsQueryType::UNSPECIFIED, query_type_);
}
HostResolverMdnsListenerImpl::~HostResolverMdnsListenerImpl() {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
// Destroy |inner_listener_| first to cancel listening and callbacks to |this|
// before anything else becomes invalid.
inner_listener_ = nullptr;
}
int HostResolverMdnsListenerImpl::Start(Delegate* delegate) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
DCHECK(delegate);
if (initialization_error_ != OK)
return initialization_error_;
DCHECK(inner_listener_);
delegate_ = delegate;
return inner_listener_->Start() ? OK : ERR_FAILED;
}
void HostResolverMdnsListenerImpl::OnRecordUpdate(
net::MDnsListener::UpdateType update,
const RecordParsed* record) {
DCHECK(delegate_);
HostCache::Entry parsed_entry =
HostResolverMdnsTask::ParseResult(OK, query_type_, record,
query_host_.host())
.CopyWithDefaultPort(query_host_.port());
if (parsed_entry.error() != OK) {
delegate_->OnUnhandledResult(ConvertUpdateType(update), query_type_);
return;
}
switch (query_type_) {
case DnsQueryType::UNSPECIFIED:
case DnsQueryType::INTEGRITY:
case DnsQueryType::HTTPS:
case DnsQueryType::HTTPS_EXPERIMENTAL:
NOTREACHED();
break;
case DnsQueryType::A:
case DnsQueryType::AAAA:
DCHECK(parsed_entry.ip_endpoints());
DCHECK_EQ(1u, parsed_entry.ip_endpoints()->size());
delegate_->OnAddressResult(ConvertUpdateType(update), query_type_,
parsed_entry.ip_endpoints()->front());
break;
case DnsQueryType::TXT:
DCHECK(parsed_entry.text_records());
delegate_->OnTextResult(ConvertUpdateType(update), query_type_,
parsed_entry.text_records().value());
break;
case DnsQueryType::PTR:
case DnsQueryType::SRV:
DCHECK(parsed_entry.hostnames());
delegate_->OnHostnameResult(ConvertUpdateType(update), query_type_,
parsed_entry.hostnames().value().front());
break;
}
}
void HostResolverMdnsListenerImpl::OnNsecRecord(const std::string& name,
unsigned type) {
// Do nothing. HostResolver does not support listening for NSEC records.
}
void HostResolverMdnsListenerImpl::OnCachePurged() {
// Do nothing. HostResolver does not support listening for cache purges.
}
} // namespace net
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